Gotoh Standard Tuners SD90 SL Relic Series 3 Per Side Gotoh Standard Tuners SD90-SL Relic Series L3+R3 Perfect for replacing worn or old tuners on Vintage guitars, or easily adding that aged look to your relic or custom project. Worn Plastic Keystone Buttons. Includes Bushings and fixing screws. Requires 8.75mm diameter (11/32") hole. Gear Ratio : 1 : 15